Terra Cresta 2 (TurboGrafx)
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Bonus ships
Pause game play, hold Up and press II, I, I, II. Then, hold Down and press I, II, II, I.
Full power
Pause game play and press [Up, Down, Left, Right] three times, II, I. Note: This code may only be enabled once per game.
Level select
Hold II and press Run ten times at the "Formation Select" screen Use Left or Right to select the starting level.